U.S. patent application number 16/502950 was filed with the patent office on 2019-10-24 for uplink signal sending method and receiving method, terminal, and base station.
The applicant listed for this patent is HUAWEI TECHNOLOGIES CO., LTD.. Invention is credited to Liuliu JI, Long QIN, Zhao ZHAO.
Application Number | 20190327685 16/502950 |
Document ID | / |
Family ID | 62789384 |
Filed Date | 2019-10-24 |
![](/patent/app/20190327685/US20190327685A1-20191024-D00000.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00001.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00002.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00003.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00004.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00005.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00006.png)
![](/patent/app/20190327685/US20190327685A1-20191024-D00007.png)
![](/patent/app/20190327685/US20190327685A1-20191024-M00001.png)
United States Patent
Application |
20190327685 |
Kind Code |
A1 |
ZHAO; Zhao ; et al. |
October 24, 2019 |
UPLINK SIGNAL SENDING METHOD AND RECEIVING METHOD, TERMINAL, AND
BASE STATION
Abstract
The present disclosure discloses an uplink signal sending method
and receiving method, a terminal, and a base station. The method
includes: receiving, by a terminal, downlink signaling delivered by
a base station, and determining, based on the downlink signaling, a
waveform used by the terminal; determining, by the terminal based
on a correspondence between a waveform and a power difference, a
power difference corresponding to a target time-frequency resource;
determining, based on the determined power difference, an uplink
transmit power of an uplink signal that is mapped on the target
time-frequency resource, and sending the uplink signal by using the
power. The target time-frequency resource refers to an OFDM symbol
multiplexed by an RS and a channel, or may be an RE that is used
for mapping a channel and that is in an OFDM symbol multiplexed by
an RS and a channel. In embodiments, a transmit power of the uplink
signal on the target time-frequency resource is reduced to reduce
the OFDM symbol multiplexed by an RS and a channel, so that a
power-limited terminal can also normally send data, thereby
optimizing use of a transmit power of the power-limited
terminal
Inventors: |
ZHAO; Zhao; (Munich, DE)
; QIN; Long; (Shanghai, CN) ; JI; Liuliu;
(Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HUAWEI TECHNOLOGIES CO., LTD. |
SHENZHEN |
|
CN |
|
|
Family ID: |
62789384 |
Appl. No.: |
16/502950 |
Filed: |
July 3, 2019 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2018/071657 |
Jan 5, 2018 |
|
|
|
16502950 |
|
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 80/08 20130101;
H04W 72/0473 20130101; H04L 5/0051 20130101; H04W 72/04 20130101;
H04L 27/26 20130101; H04L 5/0007 20130101; H04L 27/2607 20130101;
H04W 52/146 20130101; H04L 25/0226 20130101 |
International
Class: |
H04W 52/14 20060101
H04W052/14; H04W 72/04 20060101 H04W072/04; H04L 25/02 20060101
H04L025/02; H04L 5/00 20060101 H04L005/00; H04L 27/26 20060101
H04L027/26; H04W 80/08 20060101 H04W080/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 6, 2017 |
CN |
201710011447.2 |
Claims
1. An uplink signal power control method, comprising: receiving, by
a terminal, downlink signaling delivered by a base station, and
determining, based on the downlink signaling, a waveform used by
the terminal; determining, by the terminal based on a
correspondence between the waveform used by the terminal and a
power difference, a power difference corresponding to a target
time-frequency resource; and determining, by the terminal based on
the determined power difference, an uplink transmit power of an
uplink signal that is mapped on the target time-frequency resource,
and sending the uplink signal by using the uplink transmit
power.
2. The method according to claim 1, wherein the power difference in
the correspondence indicates a power difference between a first
symbol and a second symbol, the first symbol is an orthogonal
frequency division multiplexing (OFDM) symbol multiplexed by a
reference signal (RS) and a channel, and the second symbol is an
OFDM symbol not multiplexed by an RS; or the power difference in
the correspondence indicates a power difference between a first
resource element (RE) in a first symbol and a second RE in a second
symbol, the first symbol is an OFDM symbol multiplexed by an RS and
a channel, the second symbol is an OFDM symbol not multiplexed by
an RS, the first RE is an RE used for mapping a channel, and the
second RE is an RE used for mapping a channel.
3. The method according to claim 2, wherein the RS is a reference
signal used for demodulation or a reference signal used for channel
sounding, and the channel is an uplink data channel, an uplink
control channel, or a random access channel.
4. The method according to claim 1, wherein a power difference
corresponding to a cyclic prefix orthogonal frequency division
multiplexing (CP-OFDM) waveform is different from a power
difference corresponding to a discrete Fourier transform spread
orthogonal frequency division multiplexing (DFT-s-OFDM)
waveform.
5. The method according to claim 1, wherein the downlink signaling
is physical layer signaling; or the downlink signaling is higher
layer signaling.
6. A terminal, comprising: a transceiver, configured to: receive
downlink signaling delivered by a base station, and send an uplink
signal by using an uplink transmit power determined by a processor;
and the processor, configured to: determine, based on the downlink
signaling, a waveform used by the terminal; determine, based on a
correspondence between the waveform used by the terminal and a
power difference, a power difference corresponding to a target
time-frequency resource; and determine, based on the determined
power difference, the uplink transmit power of the uplink signal
that is mapped on the target time-frequency resource.
7. The terminal according to claim 6, wherein the power difference
in the correspondence indicates a power difference between a first
symbol and a second symbol, the first symbol is an OFDM symbol
multiplexed by an RS and a channel, and the second symbol is an
OFDM symbol not multiplexed by an RS; or the power difference in
the correspondence indicates a power difference between a first RE
in a first symbol and a second RE in a second symbol, the first
symbol is an OFDM symbol multiplexed by an RS and a channel, the
second symbol is an OFDM symbol not multiplexed by an RS, the first
RE is an RE used for mapping a channel, and the second RE is an RE
used for mapping a channel.
8. The terminal according to claim 7, wherein the RS is a reference
signal used for demodulation or a reference signal used for channel
sounding, and the channel is an uplink data channel, an uplink
control channel, or a random access channel.
9. The terminal according to claim 6, wherein a power difference
corresponding to a CP-OFDM waveform is different from a power
difference corresponding to a DFT-s-OFDM waveform.
10. The terminal according to claim 6, wherein the downlink
signaling is physical layer signaling; or the downlink signaling is
higher layer signaling.
11. A non-transitory computer-readable medium having executable
instructions stored thereon that, when executed by a processing
system having at least one hardware processor, perform operations
for an uplink signal power control method, the operations
comprising: receiving, by a terminal, downlink signaling delivered
by a base station, and determining, based on the downlink
signaling, a waveform used by the terminal; determining, by the
terminal based on a correspondence between the waveform used by the
terminal and a power difference, a power difference corresponding
to a target time-frequency resource; and determining, by the
terminal based on the determined power difference, an uplink
transmit power of an uplink signal that is mapped on the target
time-frequency resource, and sending the uplink signal by using the
uplink transmit power.
12. The medium according to claim 11, wherein the power difference
in the correspondence indicates a power difference between a first
symbol and a second symbol, the first symbol is an orthogonal
frequency division multiplexing (OFDM) symbol multiplexed by a
reference signal (RS) and a channel, and the second symbol is an
OFDM symbol not multiplexed by an RS; or the power difference in
the correspondence indicates a power difference between a first
resource element (RE) in a first symbol and a second RE in a second
symbol, the first symbol is an OFDM symbol multiplexed by an RS and
a channel, the second symbol is an OFDM symbol not multiplexed by
an RS, the first RE is an RE used for mapping a channel, and the
second RE is an RE used for mapping a channel.
13. The medium according to claim 12, wherein the RS is a reference
signal used for demodulation or a reference signal used for channel
sounding, and the channel is an uplink data channel, an uplink
control channel, or a random access channel.
14. The medium according to claim 11, wherein a power difference
corresponding to a cyclic prefix orthogonal frequency division
multiplexing (CP-OFDM) waveform is different from a power
difference corresponding to a discrete Fourier transform spread
orthogonal frequency division multiplexing (DFT-s-OFDM)
waveform.
15. The medium according to claim 11, wherein the downlink
signaling is physical layer signaling; or the downlink signaling is
higher layer signaling.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2018/071657, filed on Jan. 5, 2018, which
claims priority to Chinese Patent Application No. 201710011447.2
filed on Jan. 6, 2017. The disclosures of the aforementioned
applications are hereby incorporated by reference in their
entireties.
TECHNICAL FIELD
[0002] Embodiments of the present disclosure relate to the field of
communications technologies, and in particular, to an uplink signal
sending method and receiving method, a terminal, and a base
station.
BACKGROUND
[0003] At present, power control in Long Term Evolution (LTE)
mainly includes power control performed on a physical uplink shared
channel (PUSCH), a physical uplink control channel (PUCCH), a
physical random access channel (PRACH), and a channel sounding
reference signal (SRS). A basic principle is an open loop plus a
closed loop. The open loop means that a terminal estimates a path
loss path loss based on a downlink reference signal, and then
performs uplink transmit power compensation. The closed loop means
that a base station sends an instruction to a terminal based on a
received uplink transmit power of the terminal, to indicate a
dynamic power offset. Uplink power control is to ensure correct
signal reception and an interference level between terminals.
[0004] Due to a single-carrier feature in LTE, there is no SRS
multiplexing scenario. In existing LTE power control, power control
is separately performed on a PUSCH, a PUCCH, and an SRS.
[0005] However, in 5G, new radio (NR) supports a new scenario, and
a capability of a terminal is improved. Therefore, a function that
can be supported is enhanced. In NR, a cyclic prefix orthogonal
frequency division multiplexing (CP-OFDM) technology is supported
in uplink. In addition, as a supplementary technology, discrete
Fourier transform spread orthogonal frequency division multiplexing
(Discrete Fourier Transform spread OFDM, DFT-s-OFDM) also needs to
be supported.
[0006] Two waveforms: CP-OFDM and DFT-s-OFDM are supported in
uplink, and the two waveforms use a consistent pilot design.
Therefore, in NR, CP-OFDM users and DFT-s-OFDM users all support
multiplexing between a reference signal (RS) and a channel.
[0007] When multiplexing exists between an RS and a channel in a
same OFDM symbol, a PAPR in the orthogonal frequency division
multiplexing (OFDM) symbol is higher than a PAPR in another OFDM
symbol not multiplexed by an RS. Therefore, a peak-to-average power
ratio (PAPR) between OFDM symbols is low. Consequently, some
terminals use a power back-off method to meet a peak power transmit
requirement. However, by using such a power back-off method, a
transmit power of a remaining symbol not multiplexed by an RS is
also reduced. Such a performance loss is unfair to these
symbols.
[0008] In conclusion, in NR, there is a problem that the PAPR of
the OFDM symbol multiplexed by an RS and a channel is higher than
the PAPR of the OFDM symbol not multiplexed by an RS. As a result,
a power-limited terminal cannot normally send data.
SUMMARY
[0009] Embodiments of the present disclosure provide an uplink
signal sending method and receiving method, a terminal, and a base
station, to resolve a problem in NR that a PAPR of an OFDM symbol
multiplexed by an RS and a channel is higher than a PAPR of an OFDM
symbol not multiplexed by an RS.
[0010] According to a first aspect, an embodiment of the present
disclosure provides an uplink signal sending method, including:
[0011] receiving, by a terminal, downlink signaling delivered by a
base station, and determining, based on the downlink signaling, a
waveform used by the terminal;
[0012] determining, by the terminal based on a correspondence
between the waveform used by the terminal and a power difference, a
power difference corresponding to a target time-frequency resource;
and
[0013] determining, by the terminal based on the determined power
difference, an uplink transmit power of an uplink signal that is
mapped on the target time-frequency resource, and sending the
uplink signal by using the uplink transmit power.
[0014] In this embodiment of the present disclosure, the terminal
receives the downlink signaling delivered by the base station, and
determines, based on the signaling, the waveform used by the
terminal. The terminal determines, based on the correspondence
between a waveform and a power difference, the power difference
corresponding to the target time-frequency resource; and further
determines, based on the determined power difference, the uplink
transmit power of the uplink signal that is mapped on the target
time-frequency resource, and sends the uplink signal by using the
power. The target time-frequency resource refers to an OFDM symbol
multiplexed by an RS and a channel, or may be an resource element
(RE) that is used for mapping a channel and that is in an OFDM
symbol multiplexed by an RS and a channel. In this embodiment, a
transmit power of the uplink signal on the target time-frequency
resource is reduced to reduce a PAPR of the OFDM symbol multiplexed
by an RS and a channel or a PAPR of an resource element (RE) that
is used for mapping a channel and that is in the OFDM symbol
multiplexed by an RS and a channel, so that a power-limited
terminal can also normally send data, thereby optimizing use of a
transmit power of the power-limited terminal.
[0015] With reference to the first aspect, in a first
implementation of the first aspect, the power difference in the
correspondence indicates a power difference between a first symbol
and a second symbol, the first symbol is an OFDM symbol multiplexed
by a reference signal (RS) and a channel, and the second symbol is
an OFDM symbol not multiplexed by an RS; or
[0016] the power difference in the correspondence indicates a power
difference between a first RE in a first symbol and a second RE in
a second symbol, the first symbol is an OFDM symbol multiplexed by
an RS and a channel, the second symbol is an OFDM symbol not
multiplexed by an RS, the first RE is an RE used for mapping a
channel, and the second RE is an RE used for mapping a channel.
[0017] The OFDM symbol multiplexed by an RS and a channel means
that an RE used for mapping a reference signal and an RE used for
mapping a channel both exist on a plurality of time-frequency
resources of one resource unit at a same time. The OFDM symbol not
multiplexed by an RS means that, on a plurality of time-frequency
resources of one resource unit at a same time, there is no OFDM
symbol in which both a channel and a reference signal are mapped.
One resource unit includes a plurality of time-frequency resources.
For example, the resource unit is an resource block (RB) in LTE.
The time-frequency resource refers to a time-frequency unit of
resource mapping. For example, the time-frequency resource is an RE
in LTE.
[0018] In the foregoing embodiment of the present disclosure, two
definitions of the power difference are provided, and the two
definitions respectively correspond to two methods for reducing a
transmit power of the terminal. A first manner is reducing the
transmit power with regard to an entire OFDM symbol (namely, the
first symbol), and a second manner is reducing the transmit power
with regard to an RE in the first symbol. Different application
scenarios may correspond to different power control methods of the
terminal. The methods may be flexibly applied.
[0019] With reference to the first implementation of the first
aspect, in a second implementation of the first aspect, the RS is a
reference signal used for demodulation or a reference signal used
for channel sounding, and the channel is an uplink data channel, an
uplink control channel, or a random access channel.
[0020] With reference to the first aspect, or the first
implementation of the first aspect, or the second implementation of
the first aspect, in a third implementation of the first aspect, a
power difference corresponding to a CP-OFDM waveform is different
from a power difference corresponding to a DFT-s-OFDM waveform.
[0021] With reference to any one of the first aspect and the first
implementation of the first aspect to the third implementation of
the first aspect, in a fourth implementation of the first aspect,
the downlink signaling is physical layer signaling, or the downlink
signaling is higher layer signaling.
[0022] According to a second aspect, an embodiment of the present
disclosure provides an uplink signal sending method, including:
[0023] receiving, by a terminal, downlink signaling delivered by a
base station, where the downlink signaling indicates a power
difference of the terminal on a target time-frequency resource;
and
[0024] determining, by the terminal based on the downlink
signaling, an uplink transmit power of an uplink signal that is
mapped on the target time-frequency resource, and sending the
uplink signal by using the uplink transmit power.
[0025] In this embodiment of the present disclosure, the terminal
receives the downlink signaling delivered by the base station,
where the signaling indicates the power difference of the terminal
on the target time-frequency resource. The terminal determines,
based on the downlink signaling, the uplink transmit power of the
uplink signal that is mapped on the target time-frequency resource,
and sends the uplink signal by using the power. The target
time-frequency resource refers to an OFDM symbol multiplexed by an
RS and a channel, or may be an RE that is used for mapping a
channel and that is in an OFDM symbol multiplexed by an RS and a
channel. In this embodiment, a transmit power of the uplink signal
on the target time-frequency resource is reduced to reduce a PAPR
of the OFDM symbol multiplexed by an RS and a channel or a PAPR of
an RE that is used for mapping a channel and that is in the OFDM
symbol multiplexed by an RS and a channel, so that a power-limited
terminal can also normally send data, thereby optimizing use of a
transmit power of the power-limited terminal.
[0026] With reference to the second aspect, in a first
implementation of the second aspect, the power difference indicated
by the downlink signaling indicates a power difference between a
first symbol and a second symbol, the first symbol is an OFDM
symbol multiplexed by an RS and a channel, and the second symbol is
an OFDM symbol not multiplexed by an RS; or
[0027] the power difference indicated by the downlink signaling
indicates a power difference between a first RE in a first symbol
and a second RE in a second symbol, the first symbol is an OFDM
symbol multiplexed by an RS and a channel, the second symbol is an
OFDM symbol not multiplexed by an RS, the first RE is an RE used
for mapping a channel, and the second RE is an RE used for mapping
a channel.
[0028] The RS is a reference signal used for demodulation or a
reference signal used for channel sounding, and the channel is an
uplink data channel, an uplink control channel, or a random access
channel.
[0029] In the foregoing embodiment of the present disclosure, two
definitions of the power difference are provided, and the two
definitions respectively correspond to two methods for reducing a
transmit power of the terminal. A first manner is reducing the
transmit power with regard to an entire OFDM symbol (namely, the
first symbol), and a second manner is reducing the transmit power
with regard to an RE in the first symbol. Different application
scenarios may correspond to different power control methods of the
terminal. The methods may be flexibly applied.
[0030] The downlink signaling is physical layer signaling, or the
downlink signaling is higher layer signaling.
[0031] According to a third aspect, an embodiment of the present
disclosure provides an uplink signal receiving method,
including:
[0032] determining, by a base station, a waveform used by a
terminal, and sending, to the terminal, downlink signaling
corresponding to the waveform;
[0033] receiving, by the base station, an uplink signal that is
sent by the terminal and that is mapped on a target time-frequency
resource; and
[0034] determining, by the base station based on the waveform used
by the terminal and a correspondence between a waveform and a power
difference, a power difference corresponding to the uplink signal
on the target time-frequency resource, and parsing the uplink
signal based on the power difference.
[0035] In this embodiment of the present disclosure, the base
station sends the downlink signaling to the terminal, and the
terminal determines, based on the signaling, the waveform used by
the terminal. The base station receives the uplink signal that is
sent by the terminal and that is mapped on the target
time-frequency resource. The base station determines, based on the
waveform used by the terminal and the correspondence between a
waveform and a power difference, the power difference corresponding
to the uplink signal on the target time-frequency resource, and
parses the uplink signal based on the power difference. The target
time-frequency resource refers to an OFDM symbol multiplexed by an
RS and a channel, or may be an RE that is used for mapping a
channel and that is in an OFDM symbol multiplexed by an RS and a
channel. In this embodiment, a transmit power of the uplink signal
on the target time-frequency resource is reduced to reduce a PAPR
of the OFDM symbol multiplexed by an RS and a channel or a PAPR of
an RE that is used for mapping a channel and that is in the OFDM
symbol multiplexed by an RS and a channel, so that a power-limited
terminal can also normally send data, thereby optimizing use of a
transmit power of the power-limited terminal.
[0036] With reference to the third aspect, in a first
implementation of the third aspect, the downlink signaling is
physical layer signaling, or the downlink signaling is higher layer
signaling.
[0037] According to a fourth aspect, an embodiment of the present
disclosure provides an uplink signal receiving method,
including:
[0038] sending, by a base station, downlink signaling to a
terminal, where the downlink signaling indicates a power difference
of the terminal on a target time-frequency resource;
[0039] receiving, by the base station, an uplink signal that is
sent by the terminal and that is mapped on the target
time-frequency resource; and
[0040] parsing, by the base station, the uplink signal based on the
power difference on the target time-frequency resource.
[0041] In this embodiment of the present disclosure, the base
station sends the downlink signaling to the terminal, where the
downlink signaling indicates the power difference of the terminal
on the target time-frequency resource. The base station receives
the uplink signal that is sent by the terminal and that is mapped
on the target time-frequency resource. The base station parses the
uplink signal based on the power difference on the target
time-frequency resource. The target time-frequency resource refers
to an OFDM symbol multiplexed by an RS and a channel, or may be an
RE that is used for mapping a channel and that is in an OFDM symbol
multiplexed by an RS and a channel. In this embodiment, a transmit
power of the uplink signal on the target time-frequency resource is
reduced to reduce a PAPR of the OFDM symbol multiplexed by an RS
and a channel or a PAPR of an RE that is used for mapping a channel
and that is in the OFDM symbol multiplexed by an RS and a channel,
so that a power-limited terminal can also normally send data,
thereby optimizing use of a transmit power of the power-limited
terminal.
[0042] With reference to the fourth aspect, in a first
implementation of the fourth aspect, the downlink signaling is
physical layer signaling, or the downlink signaling is higher layer
signaling.
[0043] According to a fifth aspect, an embodiment of the present
disclosure provides a terminal, including:
[0044] a receiving unit, configured to: receive downlink signaling
delivered by a base station, and determine, based on the downlink
signaling, a waveform used by a terminal;
[0045] a power difference determining unit, configured to
determine, based on a correspondence between the waveform used by
the terminal and a power difference, a power difference
corresponding to a target time-frequency resource;
[0046] a transmit power determining unit, configured to determine,
based on the determined power difference, an uplink transmit power
of an uplink signal that is mapped on the target time-frequency
resource; and
[0047] a sending unit, configured to send the uplink signal by
using the determined uplink transmit power.
[0048] With reference to the fifth aspect, in a first
implementation of the fifth aspect, the power difference in the
correspondence indicates a power difference between a first symbol
and a second symbol, the first symbol is an OFDM symbol multiplexed
by an RS and a channel, and the second symbol is an OFDM symbol not
multiplexed by an RS; or
[0049] the power difference in the correspondence indicates a power
difference between a first RE in a first symbol and a second RE in
a second symbol, the first symbol is an OFDM symbol multiplexed by
an RS and a channel, the second symbol is an OFDM symbol not
multiplexed by an RS, the first RE is an RE used for mapping a
channel, and the second RE is an RE used for mapping a channel.
[0050] With reference to the first implementation of the fifth
aspect, in a second implementation of the fifth aspect, the RS is a
reference signal used for demodulation or a reference signal used
for channel sounding, and the channel is an uplink data channel, an
uplink control channel, or a random access channel.
[0051] With reference to the fifth aspect, or the first
implementation of the fifth aspect, or the second implementation of
the fifth aspect, in a third implementation of the fifth aspect, a
power difference corresponding to a CP-OFDM waveform is different
from a power difference corresponding to a DFT-s-OFDM waveform.
[0052] With reference to any one of the fifth aspect and the first
implementation of the fifth aspect to the third implementation of
the fifth aspect, in a fourth implementation of the fifth aspect,
the downlink signaling is physical layer signaling, or the downlink
signaling is higher layer signaling.
[0053] According to a sixth aspect, an embodiment of the present
disclosure provides a terminal, including:
[0054] a receiving unit, configured to receive downlink signaling
delivered by a base station, where the downlink signaling indicates
a power difference of the terminal on a target time-frequency
resource;
[0055] a transmit power determining unit, configured to determine,
based on the downlink signaling, an uplink transmit power of an
uplink signal that is mapped on the target time-frequency resource;
and
[0056] a sending unit, configured to send the uplink signal by
using the determined uplink transmit power.
[0057] According to another aspect, an embodiment of the present
disclosure provides a terminal, including:
[0058] a transceiver, configured to: receive downlink signaling
delivered by a base station, and send an uplink signal by using an
uplink transmit power determined by a processor; and
[0059] the processor, configured to: determine, based on the
downlink signaling, a waveform used by the terminal; determine,
based on a correspondence between the waveform used by the terminal
and a power difference, a power difference corresponding to a
target time-frequency resource; and determine, based on the
determined power difference, the uplink transmit power of the
uplink signal that is mapped on the target time-frequency
resource.
[0060] With reference to the sixth aspect, in a first
implementation of the sixth aspect, the power difference indicated
by the downlink signaling indicates a power difference between a
first symbol and a second symbol, the first symbol is an OFDM
symbol multiplexed by an RS and a channel, and the second symbol is
an OFDM symbol not multiplexed by an RS; or
[0061] the power difference indicated by the downlink signaling
indicates a power difference between a first RE in a first symbol
and a second RE in a second symbol, the first symbol is an OFDM
symbol multiplexed by an RS and a channel, the second symbol is an
OFDM symbol not multiplexed by an RS, the first RE is an RE used
for mapping a channel, and the second RE is an RE used for mapping
a channel.
[0062] The RS is a reference signal used for demodulation or a
reference signal used for channel sounding, and the channel is an
uplink data channel, an uplink control channel, or a random access
channel.
[0063] The downlink signaling is physical layer signaling, or the
downlink signaling is higher layer signaling.
[0064] According to a seventh aspect, an embodiment of the present
disclosure provides a base station, including:
[0065] a sending unit, configured to: determine a waveform used by
a terminal, and send, to the terminal, downlink signaling
corresponding to the waveform;
[0066] a receiving unit, configured to receive an uplink signal
that is sent by the terminal and that is mapped on a target
time-frequency resource;
[0067] a power difference determining unit, configured to
determine, based on the waveform used by the terminal and a
correspondence between a waveform and a power difference, a power
difference corresponding to the uplink signal on the target
time-frequency resource; and
[0068] a parsing unit, configured to parse the uplink signal based
on the power difference.
[0069] According to the seventh aspect, another embodiment of the
present disclosure provides a base station, including:
[0070] a processor, configured to: determine a waveform used by a
terminal; determine, based on the waveform used by the terminal and
a correspondence between a waveform and a power difference, a power
difference corresponding to an uplink signal on a target
time-frequency resource; and parse the uplink signal based on the
power difference; and
[0071] a transceiver, configured to send, to the terminal, downlink
signaling corresponding to the waveform, and receive the uplink
signal that is sent by the terminal and that is mapped on the
target time-frequency resource.
[0072] With reference to the seventh aspect, in a first
implementation of the seventh aspect, the downlink signaling is
physical layer signaling, or the downlink signaling is higher layer
signaling.
[0073] According to an eighth aspect, an embodiment of the present
disclosure provides a base station, including:
[0074] a sending unit, configured to send downlink signaling to a
terminal, where the downlink signaling indicates a power difference
of the terminal on a target time-frequency resource;
[0075] a receiving unit, configured to receive an uplink signal
that is sent by the terminal and that is mapped on the target
time-frequency resource; and
[0076] a parsing unit, configured to parse the uplink signal based
on the power difference on the target time-frequency resource.
[0077] According to the eighth aspect, another embodiment of the
present disclosure provides a base station, including:
[0078] a transceiver, configured to: send downlink signaling to a
terminal, wherein the downlink signaling indicates a power
difference of the terminal on a target time-frequency resource; and
receive an uplink signal that is sent by the terminal and that is
mapped on the target time-frequency resource; and
[0079] a processor, configured to parse the uplink signal based on
the power difference on the target time-frequency resource.
[0080] With reference to the eighth aspect, in a first
implementation of the eighth aspect, the downlink signaling is
physical layer signaling, or the downlink signaling is higher layer
signaling.
[0081] According to a ninth aspect, this application provides a
terminal, including a processor, a transceiver, and a memory. The
processor can perform the uplink signal sending method provided in
the first aspect or any implementation of the first aspect. The
memory is configured to store a computer executable instruction.
The transceiver is configured to send and receive signaling and
data.
[0082] According to a tenth aspect, this application provides a
terminal, including a processor, a transceiver, and a memory. The
processor can perform the uplink signal sending method provided in
the second aspect or any implementation of the second aspect. The
memory is configured to store a computer executable instruction.
The transceiver is configured to send and receive signaling and
data.
[0083] According to an eleventh aspect, this application provides a
base station, including a processor, a transceiver, and a memory.
The processor can perform the uplink signal receiving method
provided in the third aspect or any implementation of the third
aspect. The memory is configured to store a computer executable
instruction. The transceiver is configured to send and receive
signaling and data.
[0084] According to a twelfth aspect, this application provides a
base station, including a processor, a transceiver, and a memory.
The processor can perform the uplink signal receiving method
provided in the fourth aspect or any implementation of the fourth
aspect. The memory is configured to store a computer executable
instruction. The transceiver is configured to send and receive
signaling and data.
[0085] Further, an apparatus is provided.
[0086] In a design, the apparatus includes one or more processors
and a communications unit. The one or more processors are
configured to support the apparatus in performing a corresponding
function of a network device (for example, the base station) in the
foregoing method, for example, determining a power difference
corresponding to an uplink signal on a target time-frequency
resource. The communications unit is configured to support the
apparatus in communicating with another device, to implement a
receiving function and/or a sending function, for example, sending
downlink signaling.
[0087] Optionally, the apparatus may further include one or more
memories. The memory is configured to be coupled to a processor,
and the memory stores a program instruction and/or data necessary
for a network device. The one or more memories may be integrated
with the processor, or may be separate from the processor. This is
not limited in this application.
[0088] The apparatus may be a base station, a next generation node
B (gNB), a transmission and receiving point (TRP), or the like. The
communications unit may be a transceiver or a transceiver circuit.
Optionally, the transceiver may alternatively be an input/output
circuit or interface.
[0089] The apparatus may alternatively be a communications chip.
The communications unit may be an input/output circuit or interface
of the communications chip.
[0090] In another design, the apparatus includes a transceiver, a
processor, and a memory. The processor is configured to control the
transceiver to send and receive a signal. The memory is configured
to store a computer program. The processor is configured to run the
computer program in the memory, so that the apparatus performs the
method implemented by a network device (for example, the base
station) in the third aspect, the fourth aspect, or any
implementation of the third aspect or the fourth aspect.
[0091] In a design, the apparatus includes one or more processors
and a communications unit. The one or more processors are
configured to support the apparatus in performing a corresponding
function of the terminal in the foregoing method, for example,
determining a waveform used by the terminal. The communications
unit is configured to support the apparatus in communicating with
another device, to implement a receiving function and/or a sending
function, for example, receiving downlink signaling.
[0092] Optionally, the apparatus may further include one or more
memories. The memory is configured to be coupled to a processor,
and the memory stores a program instruction and/or data necessary
for the apparatus. The one or more memories may be integrated with
the processor, or may be separate from the processor. This is not
limited in this application.
[0093] The apparatus may be an intelligent terminal, a wearable
device, or the like. The communications unit may be a transceiver
or a transceiver circuit. Optionally, the transceiver may
alternatively be an input/output circuit or interface.
[0094] The apparatus may alternatively be a communications chip.
The communications unit may be an input/output circuit or interface
of the communications chip.
[0095] In another design, the apparatus includes a transceiver, a
processor, and a memory. The processor is configured to control the
transceiver to send and receive a signal. The memory is configured
to store a computer program. The processor is configured to run the
computer program in the memory, so that the apparatus performs the
method implemented by the terminal in the first aspect, the second
aspect, or any implementation of the first aspect or the second
aspect.
[0096] According to a thirteenth aspect, a system is provided. The
system includes the terminal and a network device.
[0097] According to a fourteenth aspect, a computer readable
storage medium is provided and is configured to store a computer
program. The computer program includes an instruction used to
perform the method according to any one of the first aspect to the
fourth aspect or any implementation of the first aspect to the
fourth aspect.
[0098] According to a fifteenth aspect, a computer program product
is provided. The computer program product includes computer program
code. When the computer program code runs on a computer, the
computer performs the method according to any one of the first
aspect to the fourth aspect or any implementation of the first
aspect to the fourth aspect.
BRIEF DESCRIPTION OF DRAWINGS
[0099] FIG. 1 is a flowchart of uplink signal sending and receiving
according to an embodiment of the present disclosure;
[0100] FIG. 2 is a schematic diagram of a target time-frequency
resource according to an embodiment of the present disclosure;
[0101] FIG. 3 is a schematic diagram of another target
time-frequency resource according to an embodiment of the present
disclosure;
[0102] FIG. 4 is a flowchart of an uplink signal sending and
receiving method according to an embodiment of the present
disclosure;
[0103] FIG. 5 is a schematic diagram of a terminal according to an
embodiment of the present disclosure;
[0104] FIG. 6 is a schematic diagram of a terminal according to an
embodiment of the present disclosure;
[0105] FIG. 7 is a schematic diagram of a base station according to
an embodiment of the present disclosure;
[0106] FIG. 8 is a schematic diagram of a base station according to
an embodiment of the present disclosure;
[0107] FIG. 9 is a schematic diagram of a terminal according to an
embodiment of the present disclosure; and
[0108] FIG. 10 is a schematic diagram of a base station according
to an embodiment of the present disclosure.
DESCRIPTION OF EMBODIMENTS
[0109] To make the objectives, technical solutions, and advantages
of the present disclosure more clearly, the following further
describes the present disclosure in detail with reference to the
accompanying drawings and the embodiments.
[0110] The embodiments of this application are applicable to a 4G
(a 4th generation mobile communications system) evolved system such
as a long term evolution (LTE) system, a 5th generation mobile
communications system (5G) system such as an access network using a
new radio access technology (New RAT), a cloud radio access network
(CRAN), or another communications system. The following explains
some terms in this application, to facilitate understanding of a
person skilled in the art.
[0111] (1) A terminal, also referred to as user equipment (UE), is
a device providing voice and/or data connectivity to a user, for
example, a handheld device or an in-vehicle device with a wireless
connection function. Common terminals include, for example, a
mobile phone, a tablet computer, a notebook computer, a palmtop
computer, a mobile Internet device (MID), and a wearable device
such as a smartwatch, a smart band, or a pedometer.
[0112] (2) A base station, also referred to as a radio access
network (RAN) device, is a device that connects a terminal to a
wireless network, and includes but is not limited to an evolved
NodeB (eNB), a radio network controller (RNC), a NodeB (Node B,
NB), a base station controller (BSC), a base transceiver station
(Base Transceiver Station, BTS), a home eNodeB (for example, a Home
evolved NodeB or a Home NodeB, HNB), and a baseband unit (BBU), a
gNodeB (g NodeB, gNB), a transmission/reception point (TRP), and a
transmission point (TP). In addition, the base station may further
include a Wi-Fi access point (AP) and the like.
[0113] An NR system supports two waveforms: CP-OFDM and DFT-s-OFDM.
Because of the following three reasons, in NR, a uniform
time-frequency mapping pattern of a demodulation reference signal
(DMRS) and/or an SRS may be designed for the two waveforms. First,
such a design may facilitate scheduling of users that use the two
waveforms in a multi-user multiplexing scenario. For example, in a
non-orthogonal multiple access (NOMA) technology, two user
terminals with different capabilities are scheduled for
multiplexing. Second, for a DMRS, such a design facilitates making
pilot patterns uniform between an uplink and a downlink, to reduce
co-channel interference between an uplink and a downlink in an
uplink and downlink dynamic scheduling technology. Third, a uniform
pilot pattern design can reduce implementation complexity for a
terminal. A specific uniform pilot pattern design may support time
division between a pilot and a PUSCH or a PUCCH, frequency division
between a pilot and a PUSCH or a PUCCH, and another manner. For a
CP-OFDM user, the frequency division manner may be used between a
pilot and a PUSCH or a PUCCH. Compared with a solution that a pilot
occupies an entire OFDM symbol in an LTE system, this solution can
be used to better use a resource and improve a system capacity. For
DFT-s-OFDM, to also support such a multiplexing manner, a
power-limited user needs to be considered. For example, for a user
with a limited peak-to-average power ratio, an overall
peak-to-average power ratio is reduced by reducing a power of a
PUSCH or a PUCCH, where multiplexing exists between the PUSCH or
the PUCCH and an RS.
Embodiment 1
[0114] FIG. 1 shows an uplink signal sending and receiving method
according to an embodiment of the present disclosure. The method
includes the following operations:
[0115] Operation 101: A base station determines a waveform used by
a terminal.
[0116] Operation 102: The base station sends, to the terminal,
downlink signaling corresponding to the waveform.
[0117] Operation 103: The terminal determines a power difference
corresponding to a target time-frequency resource.
[0118] Operation 104: The terminal determines an uplink transmit
power of an uplink signal that is mapped on the target
time-frequency resource.
[0119] Operation 105: The terminal sends the uplink signal by using
the determined uplink transmit power.
[0120] Operation 106: The base station determines a power
difference corresponding to the uplink signal on the target
time-frequency resource.
[0121] Operation 107: The base station parses the uplink signal by
using the determined power difference.
[0122] In operation 101, the base station determines the waveform
used by the terminal. The waveform used by the terminal refers to a
baseband generation manner of the terminal. The waveform determined
by the base station includes DFT-s-OFDM and CP-OFDM. DFT-s-OFDM is
a single carrier technology. The terminal performs transmission by
using a single carrier. DFT-s-OFDM is mainly applicable to a cell
edge terminal or a power-limited terminal. CP-OFDM is a
multi-carrier multiplexing technology. The terminal may perform
transmission by using a plurality of carriers.
[0123] When the base station determines that the waveform used by
the terminal is DFT-s-OFDM, the terminal first performs DFT spread
on a signal that has been mapped on a time-frequency resource, and
then performs inverse fast Fourier transform (IFFT), to generate a
baseband signal.
[0124] When the base station determines that the waveform used by
the terminal is CP-OFDM, the terminal directly performs IFFT on a
signal that has been mapped on a time-frequency resource, to
generate a baseband signal.
[0125] When determining the waveform used by the terminal, the base
station may determine and schedule, based on a reporting capability
type of the terminal (for example, the terminal is a
low-power-consumption terminal or a high-power-consumption
terminal), whether the terminal is at a cell edge or a cell center,
and the like, a type of the waveform used by the terminal.
[0126] In operation 102, the base station sends, to the terminal,
the downlink signaling corresponding to the waveform, where the
downlink signaling may explicitly or implicitly indicate the
waveform used by the terminal. Explicitly indicating the waveform
used by the terminal means that information about the waveform used
by the terminal is added into the downlink signaling to be sent to
the terminal, and implicitly indicating the waveform used by the
terminal means that the downlink signaling does not include
information about the waveform, but the waveform may be indicated
by using a delivery time, a frequency domain position, a content
scrambling manner, or the like of the downlink signaling. In other
words, when the terminal receives the downlink signaling, the
waveform may be determined based on information about the downlink
signaling such as the delivery time, the frequency domain position,
and the content scrambling manner.
[0127] In addition, the base station may send the downlink
signaling in the following manners.
[0128] Manner 1: The downlink signaling is higher layer
signaling.
[0129] In this manner, the downlink signaling is the higher layer
signaling. The base station sends the higher layer signaling to the
terminal by using a higher layer. The downlink signaling may
explicitly or implicitly indicate the waveform used by the
terminal.
[0130] Explicitly indicating the waveform used by the terminal is
used as an example. Higher layer configuration may be performed by
using a common parameter configuration, a terminal dedicated
parameter configuration, or a terminal group parameter
configuration. In an example of a terminal dedicated parameter
configuration,
TABLE-US-00001 PUSCH-ConfigDelicated ::= SEQUENCE { uplinkWaveform
ENUMERATED{CP-OFDM, DFT-s-OFDM} }
[0131] In this example, a domain of signaling uplinkWaveform is
used to indicate the waveform used by the terminal. A value of the
domain is ENUMERATED{CP-OFDM, DFT-s-OFDM}, which means that one of
the two values CP-OFDM and DFT-s-OFDM is selected as a value of the
domain.
[0132] Manner 2: The downlink signaling is physical layer
signaling.
[0133] In this manner, the downlink signaling is the physical layer
signaling (for example, downlink control information (DCI)
signaling). The base station sends the DCI signaling to the
terminal by using a physical layer. The DCI signaling may
explicitly indicate the waveform used by the terminal.
[0134] Alternatively, the base station may deliver the downlink
signaling by using the physical layer signaling, and the base
station may implicitly notify UE of a status of the waveform by
using different scrambling formats of PDCCH channels.
[0135] Explicitly indicating the waveform used by the terminal is
used as an example. In a protocol, the base station delivers DCI
signaling. DCI used to indicate various parameters used in uplink
scheduling of the terminal is referred to as uplink grant UL grant
information, and therefore, a waveform flag bit is added to the UL
grant to indicate the waveform used by the terminal. In the
waveform flag bit, 0 represents a CP-OFDM waveform and 1 represents
a DFT-s-OFDM waveform, or 0 represents a DFT-s-OFDM waveform and 1
represents a CP-OFDM waveform.
[0136] Alternatively, the waveform is indicated in a default
manner. For example, according to a configuration, the CP-OFDM
waveform is used by default, or the DFT-s-OFDM waveform is used by
default.
[0137] Manner 3: The downlink signaling is a combination of higher
layer signaling and physical layer signaling.
[0138] In this manner, the base station configures, by using the
higher layer signaling, the waveform used by the terminal on the
target time-frequency resource, and explicitly sends the waveform
to the terminal by using DCI signaling. In other words, this manner
is a combination of manner 1 and manner 2. The higher layer
signaling is used to configure the waveform, and the DCI signaling
is used for delivery.
[0139] In operation 103, the terminal determines the power
difference corresponding to the target time-frequency resource. The
target time-frequency resource refers to an OFDM symbol multiplexed
by an RS and a channel, or the target time-frequency resource is an
RE that is used for mapping a channel and that is in an OFDM symbol
multiplexed by an RS and a channel.
[0140] In addition, the terminal may learn of, in the following
manners, the target time-frequency resource that requires power
adjustment.
[0141] A pattern mapping location of a pilot is defined in the
protocol. The base station learns of, by using a mapping manner, a
location, and the like of a scheduled time-frequency resource, a
time-frequency resource on which an uplink pilot is mapped. In a
manner, as predefined in the protocol, it is stipulated that
multiplexing exists between a determined uplink pilot (a DMRS
and/or an SRS) and a channel (for example, it is stipulated that
multiplexing exists between the demodulation reference signal
(DMRS) and a physical uplink shared channel (PUSCH) at a same time
domain position). In this way, the terminal learns of the target
time-frequency resource that requires power adjustment.
[0142] In a communication process, as defined in the protocol,
different waveforms correspond to different power differences. For
example, Table 1 shows a correspondence between a waveform and a
power difference.
TABLE-US-00002 TABLE 1 Uplink waveform Power difference CP-OFDM a
DFT-s-OFDM b
[0143] Table 1 is prestored in the base station and the terminal.
When determining the waveform indicated by the base station, the
terminal may learn of the power difference by searching Table 1. A
power difference corresponding to the CP-OFDM waveform is different
from a power difference corresponding to the DFT-s-OFDM waveform,
in other words, a is different from b in Table 1. In an
implementation, generally, after power difference adjustment is
performed, a transmit power of an uplink signal corresponding to
DFT-s-OFDM needs to be lower than a transmit power of an uplink
signal corresponding to CP-OFDM. In other words, the transmit power
corresponding to DFT-s-OFDM is reduced with a greater amplitude.
For example, the transmit power corresponding to CP-OFDM is reduced
by 1 dBm while the transmit power corresponding to DFT-s-OFDM is
reduced by 2 dBm. In an implementation, it may be assumed that a=0
and b=-3 in Table 1. The transmit power corresponding to CP-OFDM
remains unchanged, and the transmit power corresponding to
DFT-s-OFDM is reduced by 3 dBm.
[0144] In this embodiment of the present disclosure, two
implementations of the power difference are provided. In an
implementation process, one of the implementations may be selected
based on an actual requirement.
[0145] Implementation 1: The power difference is a power difference
between a first symbol and a second symbol.
[0146] FIG. 2 is a schematic diagram of a target time-frequency
resource according to an embodiment of the present disclosure. In
FIG. 2, the target time-frequency resource refers to an OFDM symbol
multiplexed by an RS and a channel. As shown in FIG. 2, both an
OFDM symbol 7 and an OFDM symbol 9 are target time-frequency
resources. An RS mapped on the target time-frequency resource may
be a reference signal used for uplink channel sounding, for
example, a channel sounding reference signal (SRS); or a reference
signal used for demodulation, for example, a demodulation reference
signal (DMRS). A white space on the target time-frequency resource
represents a channel, and is used for data transmission. For
example, the channel may be an uplink data channel PUSCH), an
uplink control channel (PUCCH), or a physical random access channel
(PRACH).
[0147] In this case, the power difference is the power difference
between the first symbol and the second symbol. The first symbol is
an OFDM symbol multiplexed by an RS and a channel, and the second
symbol is an OFDM symbol not multiplexed by an RS.
[0148] The OFDM symbol multiplexed by an RS and a channel means
that an RE used for mapping a reference signal and an RE used for
mapping a channel both exist on a plurality of time-frequency
resources of one resource unit at a same time. The OFDM symbol not
multiplexed by an RS means that, on a plurality of time-frequency
resources of one resource unit at a same time, there is no OFDM
symbol in which both a channel and a reference signal are mapped.
One resource unit includes a plurality of time-frequency resources.
For example, the resource unit is an RB in LTE. The time-frequency
resource refers to a time-frequency unit of resource mapping. For
example, the time-frequency resource is an RE in LTE.
[0149] In other words, in implementation 1, for the OFDM symbol in
which an RS and a channel are mapped, power control is performed on
the entire OFDM symbol (namely, the target time-frequency
resource), to reduce a transmit power (including reduction on a
transmit power of the channel and a transmit power of the RS in the
OFDM symbol).
[0150] Implementation 2: The power difference is a power difference
between a first RE in a first symbol and a second RE in a second
symbol.
[0151] FIG. 3 is a schematic diagram of another target
time-frequency resource according to an embodiment of the present
disclosure. In FIG. 3, the target time-frequency resource is a
time-frequency resource that is used for mapping a channel and that
is in an OFDM symbol multiplexed by an RS and a channel. As shown
in FIG. 3, both a white time-frequency resource in an OFDM symbol 7
and a white time-frequency resource in an OFDM symbol 9 (namely,
white resource elements (RE)) are target time-frequency
resources.
[0152] In this case, the power difference is the power difference
between the RE in the first symbol and the RE in the second symbol.
The first symbol is an OFDM symbol multiplexed by an RS and a
channel, and the second symbol is an OFDM symbol not multiplexed by
an RS.
[0153] In other words, in implementation 2, for the OFDM symbol in
which an RS and a channel are mapped, power control is performed on
only the RE (namely, the target time-frequency resource) that is
used for mapping a channel and that is in the OFDM symbol, to
reduce a transmit power (only reduce a transmit power of a channel
in the OFDM symbol).
[0154] In operation 104, the terminal determines the uplink
transmit power of the uplink signal that is mapped on the target
time-frequency resource.
[0155] After determining the power difference corresponding to the
waveform, the terminal can determine the uplink transmit power of
the uplink signal that is mapped on the target time-frequency
resource.
[0156] The following manners may be used for implementation.
[0157] Method 1: Power reduction control is separately performed in
PUSCH, PUCCH, PRACH, and SRS power control processes.
[0158] For example, multiplexing exists between an SRS and a
channel to reduce a power of an SRS symbol. A set of the symbol is
referred to as Sa, and a set of remaining symbols in which only a
PUSCH and/or a PUCCH and/or a PRACH need(s) to be transmitted is
referred to as Sb. As shown in the following, a function p(i) means
a value obtained in a manner of performing power control (open-loop
control, closed-loop control, and the like) on the PUSCH, the
PUCCH, the PRACH, and the like in existing LTE, where k is a symbol
number. Symbols in a subframe or a timeslot are classified into two
types respectively forming the two symbol sets Sa and Sb. A value
of a function l(k) indicates a power offset of a symbol numbered k.
The function is a conditional function. When k belongs to Sa, the
value of the function l(k) is value; when k belongs to Sb, a value
of the function l(k) is 0. If it is configured that k belongs to
Sa, l(k)=-3 dB; if k belongs to Sb, l(k)=0. Herein, value=-3 dB,
and the value is obtained by using signaling configured by the base
station.
P PUSCH , c ( i , k ) = min { P CMAX , c ( i ) P PUSCH ( i ) + l (
k ) } , P PUCCH , c ( i , k ) = min { P CMAX , c ( i ) P PUCCH ( i
) + l ( k ) } , P SRS , c ( i , k ) = min { P CMAX , c ( i ) P SRS
( i ) + l ( k ) } , and ##EQU00001## l ( k ) = { 0 , k .di-elect
cons. Sb value , k .di-elect cons. Sa . ##EQU00001.2##
[0159] Method 2: Power control is first performed on a PUSCH, a
PUCCH, a PRACH, an SRS, and the like, and then a power reduction
operation is performed on some symbols in an entire subframe,
namely, symbols multiplexed by an RS and a channel.
[0160] Power control is first performed on P.sub.PUSCH,c(i),
P.sub.PUCCH,c(i), and P.sub.SRS,c(i), to obtain a power P(i) of an
entire symbol, and then power reduction is performed, where a
reduced value is a value indicated by the signaling configured by
the base station. For example, a power of 3 dB is reduced in a
multiplexed symbol. In this case, an expression may be represented
as the following formula. The formula herein means that, for the
symbol k that belongs to Sa, a power of indicated 3 dB is reduced
on a basis of P(i) obtained through calculation based on an
existing power.
P(i,k.di-elect cons.S.alpha.)=P(i)-3
[0161] The second method is easier. However, the first method can
better adapt to a maximum power, thereby avoiding a waste of the
maximum power. Which manner is to be selected may be determined
based on an actual requirement or configuration.
[0162] In operation 105, the terminal sends the uplink signal by
using the determined uplink transmit power.
[0163] In operation 106, the base station determines the power
difference corresponding to the uplink signal on the target
time-frequency resource.
[0164] The base station may determine, by searching the
correspondence table shown in Table 1, the power difference
corresponding to the uplink signal on the target time-frequency
resource.
[0165] In operation 107, the base station parses the uplink signal
by using the determined power difference.
[0166] Reception of the base station includes two parts: channel
quality measurement and demodulation.
[0167] When this embodiment of the present disclosure is used when
multiplexing exists between a DMRS and a PUSCH, during
demodulation, for an average power estimated for the DMRS,
compensation needs to be made for a reduced power of the DMRS or a
reduced power of the PUSCH when signal detection is performed on
the PUSCH.
[0168] When this embodiment of the present disclosure is used when
multiplexing exists between a DMRS and a PUCCH, during
demodulation, for an average power estimated for the DMRS,
compensation needs to be made for a reduced power of the DMRS or a
reduced power of the PUCCH when signal detection is performed on
the PUCCH.
[0169] When this embodiment of the present disclosure is used when
multiplexing exists between a DMRS and a PRACH, during
demodulation, for an average power estimated for the DMRS,
compensation needs to be made for a reduced power of the DMRS or a
reduced power of the PRACH when signal detection is performed on
the PRACH.
[0170] When this embodiment of the present disclosure is used for
channel quality measurement of an SRS, and used for calculation of
a signal to interference plus noise ratio and channel estimation by
using the SRS, compensation needs to be made for a reduced power of
the SRS or a reduced power of the PUSCH, PUCCH, or PRACH, to avoid
an error between a signal to interference plus noise ratio obtained
through calculation by using the SRS and a signal to interference
plus noise ratio on a channel.
[0171] This embodiment of the present disclosure has the following
beneficial effects:
[0172] In this embodiment, the protocol makes stipulation or the
base station sends signaling, so that the terminal can learn of a
power difference between a symbol and another symbol that is
multiplexed by an RS and a channel. Therefore, the terminal can
further proactively reduce a power of an OFDM symbol multiplexed by
an RS and a channel, to reduce a PAPR. Alternatively, in a symbol
multiplexed by an RS and a channel, a power of an RE on which an RS
is mapped is not reduced, while a power of an RE on which a channel
is mapped is reduced, to reduce a PAPR on the symbol. The terminal
receives the signaling delivered by the base station, and learns
of, by searching the table, a power difference that is on channels
of a same type and that is between a symbol multiplexed by an RS
and a channel and a symbol not multiplexed by an RS.
[0173] In Embodiment 1, the power difference is introduced to
reduce a power of an RS symbol or a power of an RE in a symbol
multiplexed by an RS and a channel, to adapt to a power-limited
terminal. For example, uplink transmission performance of the
terminal that uses DFT-s-OFDM is ensured. Therefore, in a
power-limited scenario, use of a transmit power can be
optimized.
Embodiment 2
[0174] FIG. 4 shows an uplink signal sending and receiving method
according to an embodiment of the present disclosure. The method
includes the following operations:
[0175] Operation 401: A base station determines a power difference
of a terminal on a target time-frequency resource.
[0176] Operation 402: The base station sends downlink signaling to
the terminal.
[0177] Operation 403: The terminal determines an uplink transmit
power of an uplink signal that is mapped on the target
time-frequency resource.
[0178] Operation 404: The terminal sends the uplink signal by using
the determined uplink transmit power.
[0179] Operation 405: The base station parses the uplink signal
based on the power difference on the target time-frequency
resource.
[0180] A difference between Embodiment 2 and Embodiment 1 in the
present disclosure lies in that, the base station directly
determines the power difference of the terminal on the target
time-frequency resource, and sends the power difference to the
terminal by using the downlink signaling. Therefore, there is no
need to instruct the terminal to further determine the power
difference based on a waveform and a correspondence between a
waveform and a power difference.
[0181] In operation 401, the base station determines the power
difference of the terminal on the target time-frequency resource.
Implementations of the power difference are the same as those in
Embodiment 1, and there are also two implementations.
[0182] Implementation 1: The power difference is a power difference
between a first symbol and a second symbol.
[0183] FIG. 2 is a schematic diagram of a target time-frequency
resource according to an embodiment of the present disclosure. In
FIG. 2, the target time-frequency resource refers to an OFDM symbol
multiplexed by an RS and a channel. As shown in FIG. 2, both an
OFDM symbol 7 and an OFDM symbol 9 are target time-frequency
resources. An RS mapped on the target time-frequency resource may
be a reference signal used for uplink channel sounding. For
example, the RS may be a channel sounding reference signal (SRS) or
a reference signal used for demodulation. For example, the RS may
be a demodulation reference signal (DMRS). A white space on the
target time-frequency resource represents a channel, and is used
for data transmission. For example, the channel may be an uplink
data channel, an uplink control channel, or a random access
channel.
[0184] In this case, the power difference is the power difference
between the first symbol and the second symbol. The first symbol is
an OFDM symbol multiplexed by an RS and a channel, and the second
symbol is an OFDM symbol not multiplexed by an RS.
[0185] In other words, in implementation 1, for the OFDM symbol in
which an RS and a channel are mapped, power control is performed on
the entire OFDM symbol (namely, the target time-frequency
resource), to reduce a transmit power (including reduction on a
transmit power of the channel and a transmit power of the RS in the
OFDM symbol).
[0186] Implementation 2: The power difference is a power difference
between a first RE in a first symbol and a second RE in a second
symbol.
[0187] FIG. 3 is a schematic diagram of another target
time-frequency resource according to an embodiment of the present
disclosure. In FIG. 3, the target time-frequency resource is a
time-frequency resource that is used for mapping a channel and that
is in an OFDM symbol multiplexed by an RS and a channel. As shown
in FIG. 3, both a white time-frequency resource in an OFDM symbol 7
and a white time-frequency resource in an OFDM symbol 9 (namely,
white REs) are target time-frequency resources.
[0188] In this case, the power difference is the power difference
between the RE in the first symbol and the RE in the second symbol.
The first symbol is an OFDM symbol multiplexed by an RS and a
channel, and the second symbol is an OFDM symbol not multiplexed by
an RS.
[0189] In other words, in implementation 2, for the OFDM symbol in
which an RS and a channel are mapped, power control is performed on
only the RE (namely, the target time-frequency resource) that is
used for mapping a channel and that is in the OFDM symbol, to
reduce a transmit power (only reduce a transmit power of a channel
in the OFDM symbol).
[0190] In operation 402, the base station sends the downlink
signaling to the terminal.
[0191] Similar to the downlink signaling sending manner in
Embodiment 1, this operation also has three manners of delivering
the downlink signaling by using higher layer signaling and by using
physical layer signaling.
[0192] Manner 1: The downlink signaling is higher layer
signaling.
[0193] In this manner, the downlink signaling is the higher layer
signaling. The base station sends the higher layer signaling to the
terminal by using a higher layer. The higher layer signaling
indicates the power difference of the terminal on the target
time-frequency resource.
[0194] For example, the higher layer signaling may be as
follows:
TABLE-US-00003 PUSCH-ConfigDelicated ::= SEQUENCE {
referencesignalPowerDifference INTEGER (-3, -2, -1, 0); }
[0195] Manner 2: The downlink signaling is physical layer
signaling.
[0196] In this manner, the downlink signaling is the physical layer
signaling (for example, DCI signaling). The base station sends the
DCI signaling to the terminal by using a physical layer. The DCI
signaling indicates the power difference of the terminal on the
target time-frequency resource.
[0197] For example, the base station may configure N bits in the
DCI signaling, to indicate the power difference of the terminal on
the target time-frequency resource. The N bits may indicate 2.sup.N
power differences. For example, N=2, which may indicate four power
differences. For example, as shown in Table 2:
TABLE-US-00004 TABLE 2 2 bits Power difference 00 0 01 -1 10 -2 11
-3
[0198] Manner 3: The downlink signaling is a combination of higher
layer signaling and physical layer signaling.
[0199] In this manner, the base station configures the power
difference of the terminal on the target time-frequency resource by
using the higher layer signaling, and sends, to the terminal, the
configured power difference on the target time-frequency resource
by using the DCI signaling. In other words, this manner is a
combination of manner 1 and manner 2. The higher layer signaling is
used to configure the power difference on the target time-frequency
resource, and the DCI signaling is used for delivery.
[0200] In operation 403, the terminal determines the uplink
transmit power of the uplink signal that is mapped on the target
time-frequency resource. In other words, the terminal determines,
based on the received power difference, the uplink transmit power
of the uplink signal on the target time-frequency resource. For
details about an implementation, refer to Embodiment 1. Details are
not described herein again.
[0201] In operation 404, the terminal sends the uplink signal by
using the determined uplink transmit power.
[0202] In operation 405, the base station parses the uplink signal
based on the power difference on the target time-frequency
resource.
[0203] In this operation, for details about an implementation of
parsing the uplink signal by the base station based on the power
difference on the target time-frequency resource, refer to an
implementation in Embodiment 1. Details are not described herein
again.
[0204] This embodiment of the present disclosure has the following
beneficial effects:
[0205] In this embodiment, the protocol makes stipulation or the
base station sends signaling, so that the terminal can directly
learn of a power difference between a symbol and another symbol
multiplexed by an RS and a channel. Therefore, the terminal can
further proactively reduce a power of an OFDM symbol multiplexed by
an RS and a channel, to reduce a PAPR. Alternatively, in a symbol
multiplexed by an RS and a channel, a power of an RE on which an RS
is mapped is not reduced, while a power of an RE on which a channel
is mapped is reduced, to reduce a PAPR on the symbol. The terminal
receives the signaling delivered by the base station, and learns
of, by searching the table, a power difference that is on channels
of a same type and that is between a symbol multiplexed by an RS
and a channel and a symbol not multiplexed by an RS.
[0206] In Embodiment 2, the power difference is introduced to
reduce a power of an RS symbol or a power of an RE in a symbol
multiplexed by an RS and a channel, to adapt to a power-limited
terminal. For example, uplink transmission performance of the
terminal that uses DFT-s-OFDM is ensured. Therefore, in a
power-limited scenario, use of a transmit power can be
optimized.
[0207] Based on a same inventive concept, an embodiment of the
present disclosure provides a terminal 500. As shown in FIG. 5, the
terminal 500 includes:
[0208] a receiving unit 501, configured to: receive downlink
signaling delivered by a base station, and determine, based on the
downlink signaling, a waveform used by a terminal;
[0209] a power difference determining unit 502, configured to
determine, based on a correspondence between the waveform used by
the terminal and a power difference, a power difference
corresponding to a target time-frequency resource;
[0210] a transmit power determining unit 503, configured to
determine, based on the determined power difference, an uplink
transmit power of an uplink signal that is mapped on the target
time-frequency resource; and
[0211] a sending unit 504, configured to send the uplink signal by
using the determined uplink transmit power.
[0212] Optionally, the power difference in the correspondence
indicates a power difference between a first symbol and a second
symbol, the first symbol is an OFDM symbol multiplexed by an RS and
a channel, and the second symbol is an OFDM symbol not multiplexed
by an RS; or
[0213] the power difference in the correspondence indicates a power
difference between a first RE in a first symbol and a second RE in
a second symbol, the first symbol is an OFDM symbol multiplexed by
an RS and a channel, the second symbol is an OFDM symbol not
multiplexed by an RS, the first RE is an RE used for mapping a
channel, and the second RE is an RE used for mapping a channel.
[0214] Optionally, the RS is a reference signal used for
demodulation or a reference signal used for channel sounding, and
the channel is an uplink data channel, an uplink control channel,
or a random access channel.
[0215] Optionally, a power difference corresponding to a CP-OFDM
waveform is different from a power difference corresponding to a
DFT-s-OFDM waveform.
[0216] Optionally, the downlink signaling is delivered by using a
physical layer by the base station, or the downlink signaling is
delivered by using a higher layer by the base station.
[0217] Based on a same inventive concept, an embodiment of the
present disclosure provides a terminal 600. As shown in FIG. 6, the
terminal 600 includes:
[0218] a receiving unit 601, configured to receive downlink
signaling delivered by a base station, where the downlink signaling
indicates a power difference of the terminal on a target
time-frequency resource;
[0219] a transmit power determining unit 602, configured to
determine, based on the downlink signaling, an uplink transmit
power of an uplink signal that is mapped on the target
time-frequency resource; and
[0220] a sending unit 603, configured to send the uplink signal by
using the determined uplink transmit power.
[0221] Optionally, the power difference indicated by the downlink
signaling indicates a power difference between a first symbol and a
second symbol, the first symbol is an OFDM symbol multiplexed by an
RS and a channel, and the second symbol is an OFDM symbol not
multiplexed by an RS; or
[0222] the power difference indicated by the downlink signaling
indicates a power difference between a first RE in a first symbol
and a second RE in a second symbol, the first symbol is an OFDM
symbol multiplexed by an RS and a channel, the second symbol is an
OFDM symbol not multiplexed by an RS, the first RE is an RE used
for mapping a channel, and the second RE is an RE used for mapping
a channel.
[0223] Based on a same inventive concept, an embodiment of the
present disclosure provides a base station 700. As shown in FIG. 7,
the base station 700 includes:
[0224] a sending unit 701, configured to: determine a waveform used
by a terminal, and send, to the terminal, downlink signaling
corresponding to the waveform;
[0225] a receiving unit 702, configured to receive an uplink signal
that is sent by the terminal and that is mapped on a target
time-frequency resource;
[0226] a power difference determining unit 703, configured to
determine, based on the waveform used by the terminal and a
correspondence between a waveform and a power difference, a power
difference corresponding to the uplink signal on the target
time-frequency resource; and
[0227] a parsing unit 704, configured to parse the uplink signal
based on the power difference.
[0228] Optionally, the downlink signaling is physical layer
signaling, or the downlink signaling is higher layer signaling.
[0229] Based on a same inventive concept, an embodiment of the
present disclosure provides a base station 800. As shown in FIG. 8,
the base station 800 includes:
[0230] a sending unit 801, configured to send downlink signaling to
a terminal, where the downlink signaling indicates a power
difference of the terminal on a target time-frequency resource;
[0231] a receiving unit 802, configured to receive an uplink signal
that is sent by the terminal and that is mapped on the target
time-frequency resource; and
[0232] a parsing unit 803, configured to parse the uplink signal
based on the power difference on the target time-frequency
resource.
[0233] Optionally, the downlink signaling is physical layer
signaling, or the downlink signaling is higher layer signaling.
[0234] Based on a same inventive concept, an embodiment of the
present disclosure further provides an uplink signal sending
apparatus 900. The sending apparatus 900 may be a terminal, a chip,
or the like. As shown in FIG. 9, the sending apparatus includes a
processor 901, a memory 902, and a transceiver 903. The processor
901, the memory 902, and the transceiver 903 are all connected by
using a bus 904.
[0235] The memory 902 is configured to store a computer executable
instruction. The memory 902 may be integrated into the processor,
or may be separate from the processor 901.
[0236] The processor 901 is configured to execute the computer
executable instruction stored in the memory 902.
[0237] The processor 901 executes the computer executable
instruction stored in the memory 902. In this way, the sending
apparatus 900 performs the operations performed by the terminal in
the uplink signal sending method provided in the embodiment of the
present disclosure, or the terminal deploys functional units
corresponding to the operations.
[0238] The processor 901 may include different types of processors
901 or a same type of processor 901. The processor 901 may be any
one of the following: a central processing unit (CPU), an ARM
processor, a field programmable gate array (FPGA), an
application-specific processor, and another device having a
computing processing capability. In an optional implementation, the
processor 901 may alternatively be integrated as a many-core
processor.
[0239] The memory 902 may be any one or any combination of the
following: a random access memory (RAM), a read-only memory (ROM),
a non-volatile memory (NVM), a solid state drive (SSD), a
mechanical hard disk, a magnetic disk, a disk array, and another
storage medium.
[0240] The transceiver 903 is configured to exchange data between
the sending apparatus 900 and another device. For example, the
terminal exchanges data with a base station by using the
transceiver 903. The transceiver 903 may be any one or any
combination of the following: a network interface (such as an
Ethernet interface), a wireless network interface card, and another
device having a network access function.
[0241] The bus 904 may include an address bus, a data bus, a
control bus, and the like. For ease of representation, a bold line
is used to represent the bus in FIG. 9. The bus 904 may be any one
or any combination of the following: an Industrial Standard
Architecture (ISA) bus, a Peripheral Component Interconnect (PCI)
bus, an extended industry standard architecture (EISA) bus, and
another device for wired data transmission.
[0242] Based on a same inventive concept, an embodiment of the
present disclosure further provides an uplink signal receiving
apparatus 1000. The receiving apparatus 1000 may be a base station,
a chip, or the like. As shown in FIG. 10, the receiving apparatus
1000 includes a processor 1001, a memory 1002, and a transceiver
1003. The processor 1001, the memory 1002, and the transceiver 1003
are all connected by using a bus 1004.
[0243] The memory 1002 is configured to store a computer executable
instruction. The memory 1002 may be integrated into the processor,
or may be separate from the processor 1001.
[0244] The processor 1001 is configured to execute the computer
executable instruction stored in the memory 1002.
[0245] The processor 1001 executes the computer executable
instruction stored in the memory 1002. In this way, the base
station 1000 performs the operations performed by the base station
in the uplink signal receiving method provided in the embodiment of
the present disclosure, or the base station deploys functional
units corresponding to the operations.
[0246] The processor 1001 may include different types of processors
1001 or a same type of processor 1001. The processor 1001 may be
any one of the following: a central processing unit (Central
Processing Unit, CPU for short), an ARM processor, a field
programmable gate array (Field Programmable Gate Array, FPGA for
short), an application-specific processor, and another device
having a computing processing capability. In an optional
implementation, the processor 1001 may alternatively be integrated
as a many-core processor.
[0247] The memory 1002 may be any one or any combination of the
following: a random access memory (RAM), a read-only memory (ROM),
a non-volatile memory (NVM), a solid state drive (SSD), a
mechanical hard disk, a magnetic disk, a disk array, and another
storage medium.
[0248] The transceiver 1003 is configured to exchange data between
the receiving apparatus 1000 and another device. For example, the
base station exchanges data with a terminal by using the
transceiver 1003. The transceiver 1003 may be any one or any
combination of the following: a network interface (such as an
Ethernet interface), a wireless network interface card, and another
device having a network access function.
[0249] The bus 1004 may include an address bus, a data bus, a
control bus, and the like. For ease of representation, a bold line
is used to represent the bus in FIG. 10. The bus 1004 may be any
one or any combination of the following: an Industrial Standard
Architecture (ISA) bus, a Peripheral Component Interconnect (PCI)
bus, an extended industry standard architecture (EISA) bus, and
another device for wired data transmission.
[0250] An embodiment of the present disclosure provides a computer
readable storage medium. The computer readable storage medium
stores a computer executable instruction. A processor of a terminal
or a processor of a base station executes the computer executable
instruction. In this way, the terminal or the base station performs
the operations performed by the terminal or the base station in the
uplink signal sending method provided in the embodiment of the
present disclosure, or the terminal or the base station deploys
functional units corresponding to the operations.
[0251] An embodiment of the present disclosure provides a computer
program product. The computer program product includes a computer
executable instruction, and the computer executable instruction is
stored in a computer readable storage medium. A processor of a
terminal or a processor of a base station may read the computer
executable instruction from the computer readable storage medium.
The processor executes the computer executable instruction. In this
way, the terminal or the base station performs the operations
performed by a network management device in the uplink signal
sending method provided in the embodiment of the present
disclosure, or a network management device deploys functional units
corresponding to the operations.
[0252] A person skilled in the art understands that the embodiments
of the present disclosure may be provided as a method, a system, or
a computer program product. Therefore, the embodiments of the
present disclosure may use a form of hardware only embodiments,
software only embodiments, or embodiments with a combination of
software and hardware. Moreover, the embodiments of the present
disclosure may use a form of a computer program product that is
implemented on one or more computer-usable storage media (including
but not limited to a magnetic disk memory, a CD-ROM, an optical
memory, and the like) that include computer-usable program
code.
[0253] The embodiments of the present disclosure are described with
reference to the flowcharts and/or block diagrams of the method,
the device (system), and the computer program product according to
the embodiments of the present disclosure. It is understood that
computer program instructions may be used to implement each process
and/or each block in the flowcharts and/or the block diagrams and a
combination of a process and/or a block in the flowcharts and/or
the block diagrams. These computer program instructions may be
provided for a general-purpose computer, a dedicated computer, an
embedded processor, or a processor of any other programmable data
processing device to generate a machine, so that the instructions
executed by a computer or a processor of any other programmable
data processing device generate an apparatus for implementing a
function in one or more processes in the flowcharts and/or in one
or more blocks in the block diagrams.
[0254] These computer program instructions may be stored in a
computer readable memory that can instruct the computer or any
other programmable data processing device to work in a specific
manner, so that the instructions stored in the computer readable
memory generate an artifact that includes an instruction apparatus.
The instruction apparatus implements a function in one or more
processes in the flowcharts and/or in one or more blocks in the
block diagrams.
[0255] These computer program instructions may be loaded onto a
computer or another programmable data processing device, so that a
series of operations and operations are performed on the computer
or the another programmable device, thereby generating
computer-implemented processing. Therefore, the instructions
executed on the computer or the another programmable device provide
operations for implementing a function in one or more processes in
the flowcharts and/or in one or more blocks in the block
diagrams.
[0256] A person skilled in the art can make various modifications
and variations to this application without departing from the
spirit and scope of this application. This application is intended
to cover these modifications and variations of this application
provided that they fall within the scope defined by the following
claims and their equivalent technologies.
* * * * *